Controlling device



Feb. 23, 1943. G. H. FUEHRER 2,312,156

CONTROLLING DEVICE Filed 001. 11, 1941 2 Sheets-Sheet 1 INVENTOR Geazye HEB/2P6! HIS ATTORNEY Feb. 23, 1943. G.H.FL IEHRER 2,312,156

' CONTROLLING DEVICE Filed :Oct. '11, 1941 2 Sheets-Sheet 2 INVENTOR HIS ATTORNEY- Patented Feb. 23, 194-3 GONTROLLING DEVICE GeorgeH. Fuehrer, Phillipsburg, N. J., assignor t-o Ingersoll-Rand Company, New York,v N. Y., a corporation of New Jersey Application October 11, 1941, Serial No. 414,561

3 Claims.

This invention relates to controlling devices, and more particularly to a controlling device for a rotatable member.

One object of the invention is to prevent unauthorized rotation of the rotary member.

Another object is to selectively control the direction of rotation of the rotatable member.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawings accompanying this specificationand in which similar reference numerals refer to similar parts,

Figure 1 is a longitudinal side view of a rock drilling mechanism having the invention applied thereto,

Figure 2 is a longitudinal elevation, partly in section, of the controlling device,

Figure 3- is a transverse view taken through Figure 2 on the line 3-3,

Figure 4 is a plan view, in section, taken through FigureB on the line 4-4, and

Figures 5; 6 and '7 are transverse views taken through Figure 2- on the lines 5-5; 6-6 and |'l", respectively.

Referring more particularly to the drawings, the invention is shown embodied in a drilling mechanism comprising a rock drill 29 having a hammer piston 19 for actuating a working ,implement' 2!, a shell 22' serving as a guide for the rock drill and a feed controlling device 23 at the rearward end of the-shell 22 for determining the direction of movement of the rock drill 29 with respect to the shell. The rock drill 2E) and the shell 22 may be of well known types having, respectively; ribs-2 1' and;guideways 25 to slidably receivethe ribs 2-4;

The' feedcontrolling: device 23' is connected to the end of the shell bybolts 26; It comprises a casing 21- having end heads 28' and 29, the latter acting as a bearing for the rearward portion of a screw3ll'that is threadedly connected with'the rock drill 2i) and supported at its front end, in a well known manner, by the shell- 22. The

threaded connection between the screw 36 and the rockdrill may be of a well-known-ty-pe whereinthe threads are so inclined that the screw will becausedto-rotate by the movement of the rock .drill. 20- relatively to the shell 22 As a preferred arrangement the, screw 35 is provided withan enlarged bearing portion 3! and a. bushing 32. is disposed: in the head '19 to serve as a renewable bearing for the enlarged portion 31,.

The portion of the screw 30 immediately rearthe form of a tapered shank 33 having a threaded stem 34 that extends into a cavity 35 in the head 28. The tapered shank 33 carries a pair of flanges 36 and 31 that lie, respectively, adjacent the heads 29 and 28' and are secured upon the shank 33 by a nut 38 threaded upon the stem 34 to act against an extension 39 on the flange 31. The flanges 36 and 31 abut each other so that the force of the nut 39 will be transmitted through the flange 31 to the flange 35 for securing the latter to the shank 33.

The flanges 36 and 31 are of the same external diameter and on their peripheral surfaces til are arranged, respectively, rings 4i and t2 that are rotatable upon the flanges and are serrated i'nternally and externally to provide teeth G3 and 44. In efiect, the rings M and 42 constitute abutments to determine the direction in which the screw 30 may rotate to assure movement of the rock drill 20in either a forwardly or a rearwardly direction along the shell 22. The means provided for interlocking engagement with the screw and the rings are shown as being in the form of pawls t5 and 46 arranged, respectively, in the flanges 36 and 3?. The pawls which may be of identical form are of the well known type comprising a trunnion l! journaled in a bore 48 in the flanges and having a wing 49' extending through a recess 53, in the periphery of the flange, for engagement at its free end with the teeth 43 of the rings. The pawls 45 and 46 ex tend in different directions and are constantly urged outwardly for engagement with the teeth 43 by spring-pressed p-lungers 5i arranged in the flanges to engage the Wings 49.

Although, as stated, the rings 4| and 42' are free to rotate within the casing 21, it is essential that, during certain conditions of operation of the device, they be held stationary in order that they may serve their function as immovable abutments for the pawls 45 and M5. The means provided for thus locking the rings in a flxed position in the casing consists of a pair of looking members 52 and 53 arranged within a bore 54 that lies in parallelism with the axis of the casing and communicates at one side thereof with the interior of the casing. The locking members 52 and 53' are rotatable within the bore 54. They are of partly annular shape and their outer surfaces 55 engage slidably the wall of the bore 54 to centralize the locking members with respect to the bore.

The locking members are similar in all respects but are so arranged within the bore 54 that their wardly of the enlarged bearing portion BI is in 55 key or looking ends 55, adapted for engagement with the teeth 44 of the rings, lie in opposite sides of the bore 54. Thus, the locking end 56 of the locking member 52 lies on the left hand side of the bore 54 and the corresponding portion of the locking member 53 lies on the right hand side of the bore 54, as Figures 1 and 2 are viewed from the right hand end of the drawings, for engagement, respectively, with the teeth 44 of the rings 4| and 42.

In order that the locking members 52 and 53 may be constantly urged rotatably in a direction for engagement with the rings said locking members are provided at their opposed ends with wings 51 that lie in the same transverse plane and a spring 58, of the coil type, is interposed between them to rotate the locking members toward their ring-locking positions.

Means are provided for selectively moving the T locking members out of engagement with the teeth 44. To this end a manually operable rod 59 is extended axially through the locking members to seat at its front end in a socket G in the casing 21 and at its opposite end in a bore 6| in the head 28. On the portions of the rod 59 lying in the transverse planes of the locking members 52 and 53 are wings 62 and 63 that extend in differ ent directions for engagement with the locking ends 56 for rocking the locking members out of engagement with the teeth 44. A stem 64 on the rod 59 lies exteriorly of the head 28 and carries a lever 65 whereby the rod 59 may be rotated to its different controlling positions. The lever is secured to the stem by a nut 66.

Means are provided for locking the rod 59 in its difierent controlling positions. To this end a series of ribs, designated 61, 68 and 69, are formed longitudinally along the surface of an enlarged portion III of the rod 59 lying in the side of the head 28. The ribs 61 and 69 are suitably located to correspond with the positions of the wings 62 and 63, respectively, On the rod 59.

The rib 68 lies intermediate the ribs 61 and 69 and diametrically opposite thereof and on the enlarged portion 10 is a bearing surface II that engages the surface of the bore 54. The grooves or spaces 12 located on opposite sides of the ribs 61, 68 and 69 form seating surfaces for a latch.

I3 reciprocable on a rod I4 which is pivotally mounted on its lower end upon a pin I seated in the head 28. A spring I6 encircling the rod 14 acts against the latch I3 to press it constantly against the enlarged portion I0.

As a preferred arrangement, the latch I3 is provided with a notch 'II across its end surface to receive the ribs 61, 68 and 69 and to define wings 18 on the end of the latch for engagement with the side surfaces I9 of the ribs for holding the rod 59 immovable in a desired position. In order to prevent rotation of the latch I3 about its axis said latch is preferably of substantially rectangular cross sectional form and of only slightly smaller dimensions than the space it occupies in the head 28. Thus, the latch may reciprocate freely upon the rod 14 for engagement and disengagement with the ribs but will be prevented from rotating about its axis.

In the operation of the device and with the locking member 52 in locking engagement with the ring 4| and the locking member 53 disengaged from the ring 42 a stationary abutment will be provided for the pawl 45. During the ensuing operation of the rock drill 29 the jars occasioned by the reversal of the piston I9 at the forward end of its stroke and imparted to the rock drill will move the rock drill forwardly and 9 limit of its travel along the shell 22 the rod 59 is rotated to a position in which the rib 6'! lies within the notch 17. This movement of the rod will move the locking member 52 out of engagement with the ring 4| and carry the locking member 53 into engagement with the ring 42. The screw 39 is then free to rotate in an opposite hand direction and will be rotated thus each time the piston I9 applies a jar to the rock drill upon reversal of the piston at the rearward end of its stroke. Upon each revolution of the screw 39 the pawl 46 will be carried to a new position on the inner surface of the ring 42 to resist reverse rotation of the screw at the instant of reversal of the piston I9 at the end of its forward stroke. Continued operation of the hammer piston I9 will cause the rock drill to be retracted to the rearward end of the shell in readiness for another run of drilling.

In the event that it be desired to restrain the rock drill against movement along the shell 22, as when starting a newdrill hole, the rod 59 is rotated to a position in which the rib 68 lies within the notch 11. In this position of the rod 59 the rings 62 and 63 on the rod will be removed from the paths of movement of the locking ends 56 of the locking members. The spring 58 will then rotate both locking members into locking engagement with the rings to hold them stationary and, inasmuch as the pawls and 46 are also interlocked with their respective rings the screw 30 will be held stationary and the rock drill will then remain immovable on the shell 22, unaffected by the jars imparted to it by the hammer piston.

I claim:

1. A controlling device, comprising a casing, a pair of rings rotatable in the casing and having teeth on their inner surfaces, a rotary member in the casing and the rings, separate rotary locking members of partly annular shape in the casing for each ring, means acting constantly to force the locking members into locking engage ment with the rings, manually operable means extending through the locking members and being rotatable with respect thereto for selectively moving the locking members out of engagement with the rings, and pawls in the rotary member to cooperate with the teeth for determining the direction of rotation of the rotary member.

2. A controlling device, comprising a casing, a pair of rings rotatable in the casing and having teeth on their inner surfaces, a rotary member in the casing and the rings, separate rotary locking members of partly annular shape in the casing for each ring, a spring interposed between the locking members and acting constantly to force each locking member into locking engagement with a ring, manually operable means extending axially through the locking members and being rotatable for selectively moving the locking members out of locking engagement with the rings, and pawls in the rotary member to cooperate with the teeth for determining the direction of rotation of the rotary member.

3. A controlling device, comprising a casing, a pair of rings rotatable in the casing and having teeth on their inner and outer surfaces, a rotary member in the casing and the rings, separate locking members of partly annular shape for each ring rotatable in the casing, a spring interposed between the locking members acting constantly to force the locking members into locking engage ment with the teeth on the outer surfaces of the rings, an actuator extending axially through the locking members movable to different positions to move one or the other of the locking members out of engagement with a ring and being movable to still another position to permit the spring to move the locking members simultaneously into locking engagement with the teeth on the outer surfaces of the rings, and pawls in the rotary member to cooperate with the teeth on the inner surfaces of the rings for determining the 10 direction of rotation of the rotary member.

GEORGE H. FUEHRER. 

